Seamless metal jar.



No. 663,392. Patented Dec. 4, I900. A. R. PIPER.

SEAMLESS METAL JAR.

(Application filed Sept. 17, 1900.)

mmmuu: a uu 3 z" w 1 a @Xhm WM aHoz/mem UNTTEE STATES PATENT FFICE.

ALEXANDER ROSS PIPER, OF SING SING, NE? YORK, ASSIGNOR TO THE SEAMLESSMETAL WARE COMPANY OF NEW YORK.

SEAM LESS METAL JAR.

SPECIFICATION forming part of Letters Patent No. 663,392, dated December4, 1900.

Application filed September 17, 1900. Serial No. 30,307. (No model.)

To whom it nuty concern.-

Be it known that I, ALEXANDER ROSS PIPER, a citizen of the UnitedStates, residing at Sing Sing, county of \Vestchester, State of NewYork, have invented certain new and useful Improvements in SeamlessMetal Jars, of which the followingis a full, clear, and exact.description, reference being had therein to the accompanying drawings,in which- Figure 1 represents a vertical section of a vessel embodyingmy invention, and Fig. 2 a similar view showing one method of attachinga cover to the vessel.

The object of the invention is to produce a can or jar having a flangedcover-holding mouth or .rim of exceptional strength and without seam orother device to weaken it or interrupt its continuity, so thathermeticallytight closure devices may be fitted or secured to it undercomparatively heavy pressure without spreading or otherwise injuring theflanged mouth, as more fully hereinafter set forth.

Referring to the drawings by letters, a designates the body of thevessel, on which is formed the cover receiving and holding flangeconstituting the rim or mouth of the vessel, said flange consisting of apart b, bent out horizontally from the body of the vessel and forming aninternal annular shoulder b around the upper edge of the body portion a,and a part If, formed of an upward continuation of the part b and havingan inward-extending bead bformed around its upper edge, said bead beingof less width than the part b, so that a sealing-disk, constituting partof the closure devices, may be inserted in the mouth of the vessel andallowed to rest upon the shoulder 5 The vessel is made of a single pieceof sheet metal and is formed by being forced through a series of diessuccessively decreasing in size until the desired depth of vessel issecured, asis well known in the art of stamping and spinning sheetmetal. After the desired depth is secured the shouldered flange isformed either by stamping or spinning, the rough upper edge of thevessel is trimmed 0E, and the bead then formed by turning inthetriminededgeinasuitablemanner. Thus forming the vessel imparts greatstrength to its flanged portion, since the process of drawing orstamping the metal increases its density at the upper edge of thevessel, just where the greatest strength is required.

The vessel may of course be used in connection with any suitable closuredevice; but it is especially designed for employment with devices of thesort shown in Fig. 2, in which a designates an elastic or compressibledisk of suitable material fitting within the flanged mouth and bearingon shoulder b and held in place by means of a metal disk d and anannular metal cap-strip e engaging over the edge of the disk and bentunder the external shoulder formed by the parts I) and b In attachingthe closure devices the sealingdisk is subjected to great pressure, sothat it will entirely fill the flanged portion, being pressed outwardunder the bead and against the wall and is held in this compressedcondition by the disk d and the cap-strip e, the lower edge of which isbent under the external shoulder. It will be observed that with aclosure device of this character both the body of the can and theflanged mouth must be capable of withstanding considerable pressure, theshoulder 12 especially receiving a great portion of the strain. Thisnecessary strength is secured by making the vessel in the manner setforth;

It will be further observed that it is essential that there shall be aninternal shoulder to take the pressure of the sealing-disk and anexternal shoulder to afford a means of engagement for the locking-capand also that the bead shall turn inward, not only to leave the exteriorof the flange free of obstruction, but also to afford a sealing-flangeunder which the outer edge of the sealingdisk is forced in the processof closing the vessel. The bead also strengthens the upper edge of thevessel and affords a bearing and stop for the locking-cap.

It will be obvious that with a closure device of the sort described itwould be impracticable to employ a seamed vessel, not only because theseam would be liable to open under the heavy pressure employed, but alsobecause it would be difficult to make a seamed can of the shape hereinshown. A seam any place in the flange would be objecneath the head, adisk on top of the sealingdisk, and a locking device engaging said diskand the external shoulder formed by the outward-extending part and theupward extension, for the purpose set forth.

In testimony whereof I hereunto affix my signature, in the presence oftwo witnesses, 20

this 16th day of August, 1900.

ALEXANDER ROSS PIPER.

Witnesses:

BURTON R. DODGE, O. A. STUART.

